Aspect Ratio Calculator
Resize an image or video while keeping its proportions, with the simplified ratio.
Results
New height
675.00
px
Ratio
1.77778
Greatest common divisor
120
What this tool does
Give the original dimensions and the new width, and the matching height keeps the picture from stretching. The greatest common divisor is shown too, because dividing both sides by it gives the familiar form: 1920 × 1080 reduces to 16:9.
Formula
new height = new width × height original ÷ width original
Variables
| Symbol | Meaning | Unit |
|---|---|---|
w | Original width | px |
h | Original height | px |
nw | New width | px |
NH | New height | px |
RT | Ratio | — |
GC | Greatest common divisor | — |
Worked example
- Original width1920 px
- Original height1080 px
- New width1200 px
- New height675.00 px
- Ratio1.77778
- Greatest common divisor120
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.